--Begins with the union of sperm and egg
--Only one sperm can fertilize an egg During Fertilization...
--Sperm releases enzymes that pierce through the egg's coating
--Sperm’s surface proteins bind to the egg's receptor protein
--Sperm and egg plasma membranes fuse and nuclei unite
--Changes in the egg membrane prevents entry of additional sperm
--Fertilization egg called (zygote)
--Develops into embryo
Zygote to Blastula through cleavage
Embryonic Development
1) Zygote Sperm fertilizes eggs Cleavage-rapid series of cell division- first few mitotic cell division 2) Morula Consists of a solid ball of cells Embryonic stem cells phase 3) Blastula During each mitotic division the embryo does not increase is size the existing cytoplasm divides Implantation--When blastocyst attaches to the uterine wall 4) Gastrula Formation of the 3 germ layers -Endoderm-inner most layer-becomes organs -Mesoderm-middle layer-becomes muscles -Ectoderm-outer most layer-becomes skin
Fertilization...
--Begins with the union of sperm and egg
--Only one sperm can fertilize an egg
During Fertilization...
--Sperm releases enzymes that pierce through the egg's coating
--Sperm’s surface proteins bind to the egg's receptor protein
--Sperm and egg plasma membranes fuse and nuclei unite
--Changes in the egg membrane prevents entry of additional sperm
--Fertilization egg called (zygote)
--Develops into embryo
Embryonic Development
1) Zygote
Sperm fertilizes eggs
Cleavage-rapid series of cell division- first few mitotic cell division
2) Morula
Consists of a solid ball of cells
Embryonic stem cells phase
3) Blastula
During each mitotic division the embryo does not increase is size the existing cytoplasm divides
Implantation--When blastocyst attaches to the uterine wall
4) Gastrula
Formation of the 3 germ layers
-Endoderm-inner most layer-becomes organs
-Mesoderm-middle layer-becomes muscles
-Ectoderm-outer most layer-becomes skin